Theme Installation Is Asking For Directory(Base Directory) Permission

I have php and laravel framework theme I bought from the internet. When I try to install its asking for "Base Directory"Permission. I don't know which dirctory is actually asking for? .And I tried these kinds of commands from StackOverflow. My server os is Alpine linux. I can change myself I just don't know which directory it is? Screenshot

chmod 775 $(find /var/www/html -type f)
chmod 775 -R /var/www/html
chmod -R a+rX *